請用此 Handle URI 來引用此文件:
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/87575
標題: | 藉由壓縮感知做盲通道估測應用於巢狀陣列混合式波束賦形系統 Blind Channel Estimation via Compressed Sensing on Hybrid Beamforming Systems based on Nested Array |
作者: | 黃威豪 Wei-Hao Huang |
指導教授: | 蘇炫榮 Hsuan-Jung Su |
關鍵字: | 毫米波,大規模多輸入多輸出,巢狀陣列,混合式波束賦形,通道估測,壓縮感知, Millimeter Wave,Massive MIMO,Nested Array,Hybrid beamforming,Channel Estimation,Compressed Sensing, |
出版年 : | 2022 |
學位: | 碩士 |
摘要: | 毫米波系統因超高頻而遭受嚴重的路徑損耗。從用戶到基地站的路徑數量遠少於傳統無線通信系統。我們使用大規模多輸入多輸出系統和混合式波束賦形來補償嚴重的路徑損耗。此外,我們提出了在混合系統中重新排列天線的概念。具體來說,天線通過具有交錯連接的子陣列結構排列成巢狀陣列。巢狀陣列不僅增加了自由度,而且避免了角度模糊的影響。當天線數量增加時,基於導頻的信道估計算法變得更加低效。因此,我們提出了一種避免使用導頻的方法。在分析我們的系統時,發現不等空間模式的影響會影響估計到達方向的準確性。我們使用壓縮傳感技術去估計每條路徑上受不平等空間模式影響的入射方向。最後利用衰落矩陣的特殊結構消除虛假的入射方向,克服不等空間模式的影響並估計各路徑的衰落增益。 Millimeter-wave (mmWave) systems suffer from severe path loss because of ultra-high frequencies. The number of paths from users to the base station (BS) is much less than that of conventional wireless communication systems. We use massive multi-input multi-output (MIMO) systems and hybrid beamforming (HBF) for compensating severe path loss. In addition, we propose the concept of rearranging the antennas in a hybrid system. Specifically, the antennas are arranged into a Nested array through a subarray-based structure with interleaved connections. A Nested array not only increases the degrees of freedom (DOF) but also avoids the influence of angle ambiguity. The pilot-based channel estimation algorithms become more inefficient when the number of antennas increases. Therefore, we propose a method that avoids using the pilot. In analyzing our system, an effect of the unequal spatial pattern was found to affect the accuracy of estimating the direction of arrival (DOA). We estimate the DOA affected by the unequal spatial pattern for each path is estimated using compressive sensing techniques. Finally, the particular structure of the fading matrix is used to eliminate the false DOA and overcome the influence of the unequal spatial pattern, and the fading gain of each path is estimated. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/87575 |
DOI: | 10.6342/NTU202210074 |
全文授權: | 同意授權(限校園內公開) |
電子全文公開日期: | 2024-10-20 |
顯示於系所單位: | 電信工程學研究所 |
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